问题
补全对话，情景问答
| 读句子，选择正确的应答，并把序号写在题前括号内。 | |
| ( )1. How is your grandpa? ( )2. May I come in? ( )3. Are we all here? ( )4. How much are they? ( )5. Are you Mr Brown? ( )6. When's Spring Festival? ( )7. Where are the boys from? ( )8. What time is it now? ( )9. Can you tell me the way to Zhongshan Park? ( )10. what's thirtythree and sixty? | A. Two hundred yuan. B. Yes, I am. C. Sure. It's over there. D. It's in January or February. E. It's about nine thirty. F. Come in, please. G. It's ninety-three. H. No, Ping Ping is ill at home. I. Fine, thanks. J. They're from France |
答案
1. I 2. F 3. H 4. A 5. B 6. D 7. J 8. E 9. C 10. G
，重锤的质量为
，重力加速度为
。
是速度为零的点，
、
、
为从合适位置选取的三个连续点 (其他点未画出) 
，量得此三点与
、
、
取图18中
。（用已知的符号表示）
